Hey guys I need help with this question. Solve the system by substitution: x=-1 and 4x+2y=16

Ahigh definition tv cost $800 with a down payment of 2/5 of the cost. how much is left to pay, in dollars after the down payment has been made?

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9